Abstract:The experimcnts of coatirtuous casting and directional solidifing titanium ahoy slabs were performed in a multi-functional electromagnetic casting apparatus with rectangular cold crucible. The influences of process parameters were evaluated on the surface qualities and macrostructures of the casting slabs. It is shown that the surface variations of the slabs get to be well with the increasing of the number of coil turns and the input power. While, it seems to be bad with the increase of the withdrawal velocity and the reduce of the relative position of dummy to the induction coils. The limits of influence of process parameters are deduced as that the first one is the induction coil, the second one is the input power, the third one is the withdrawal velocity, and the last one is the dummy position. With the selective optimized parameters, the slabs free from cracks and ripples are obtained under the experimental conditions. It is interpreted that the variations of meniscus volumes has the significant effects on the casting process, which in turn to be the results of surface qualities of cast slabs. With the increasing of the number of induction coil turns and the decreasing of the withdrawal velocities, the numbers of grains reduced and the grains are parallel to the growth direction. The slabs with both good surface quality and uni-directional macrostructure were cast in cold crucible whose cross section is approximately rectangular.